During the development of the polyurethane (PU) industry, one of its biggest challenges has been synthesis and formulation-related due to a lack of renewable resources and thus an over-reliant dependence on fossil reserves which has led to considerable research effort focused on alternative renewable sources of supply. In this study, PET bottle waste and castor oil have been considered as alternative sources for the synthesis of a PU adhesive. A cheap and environmentally friendly synthesis pathway for polyols is provided using depolymerization reactions of recyclable materials. The structures of the polyols have been demonstrated using Fourier-transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. Different NCO/OH ratios with calculated amounts of MDI were used to prepare polyols which were then employed during PU preparation and their effects on the resultant PUs were investigated. Solvent-free polyurethane adhesives were synthesized. Changes in the properties of PU synthesized by the addition of castor oil and boron species to the structure were also determined. The thermal behaviour of PU samples were characterized by DSC-TG; and functional group detection and covalent bonding formation were investigated via FTIR analysis.

在聚氨酯（PU）工业的发展过程中，由于缺乏可再生资源，因此其最大的挑战之一是与合成和配方相关，因此对化石储量的过分依赖导致了针对替代品的大量研究工作。可再生的供应来源。在这项研究中，PET瓶废料和蓖麻油已被认为是合成PU粘合剂的替代来源。使用可回收材料的解聚反应提供了一种廉价且环保的多元醇合成途径。多元醇的结构已通过傅里叶变换红外光谱（FTIR）和核磁共振（NMR）光谱进行了证明。使用具有计算量的MDI的不同NCO / OH比值来制备多元醇，然后将其用于PU制备中，并研究其对所得PU的影响。合成了无溶剂聚氨酯粘合剂。还确定了通过在结构中添加蓖麻油和硼物种合成的PU性能的变化。用DSC-TG表征PU样品的热行为。通过FTIR分析研究了官能团的检测和共价键的形成。